Stencil sheet and process of applying same to workable surfaces



Jah. 28, 1930. 1.. D. DAVIS 1,744,870

STENCIL SHEET AND PROCESS OF APPLYING SAME TO WORKABLE SURFACES FiledJuly '26. 1928 Patented Jan 2 1930 UNITED sures PATENT" OFFICE DAVIS, FPHILADELPHIA, PENNSYLVANIA STENCIL SHEET AND PROCESS OF PPLYJ IENG SAMETO WORKABLE SURFACES Application filed July 26, 1928. Serial No.295,474.

This invention relates to a stencil sheet fois the article thereafterset aside to permitthe composition to ber ome sulficiently hard topermit sketching. of the figure to be produced,

on the surface of the composition.

After the composition assumed the requisite degree of solidification topermit of the said sketching on the surface thereof the figure, to beproduced on the surface of the article, was sketched on the surface ofthe composition and the outline of the sketched figure cut through thecomposition to the underlying surface of the article, after which theportion of the layer of composition lying with the cut outline of thefigure was removed. exposing the portion of surface of the article whichwas to he insculptured by the sand blast method.

The layer of composition-'surrounding the figure functions as a stencilto prevent the covered portion of thesurface of the article from beingaffected by the sand used in carrying out the sand blast method.

The composition being, more or less of a hydroscopic nature requiredconsiderable time to assume the proper state of solidity to permit ofthe sketching of the figure thereon. depending on atmospheric conditionsto which it was exposed.

Another disadvantage of the method of spreading the composition on thesurface to he insculpturcd is that it is extremely difficult and almostimpossible to produce manually a layer of the composition having auniform thickness throughout. which causes the composition to dry outunevenly and is, therefore, diflicult to sketch upon and to cut.

The principal object of my invention is to provicc the composition in asheet form of uniform thickness throughout and to provide a suitableliaclfing on one side of the sheet of composition which will besufficiently tough to permit of the handling of the sheet, and which maybe readily peeled olf or otherwise removed from the composition when thesame has been applied to the surface to be insculptured.

My invention also resides in the method employed in placing a uniformlayer of composition on the surface to be insculptured, which comprisesthe use of a web of tough paper, such as parchment or a suitable fabricwhich will not disintegrate when saturated with water. coating the webwith a layer of the composition f of uniform thickness throughout whilethe composition is in a plastic state. drying the composite sheet.subsequently moistening the exposed surface of the composition whichsoftens this face of the composition suificiently to cause it to adhereto the surface to be insculptured. applying the sheet to the saidsurface to be insculptured, moistening the backing sheet either beforeor subsequent to the application of the sheet to said surface to beinsculptured which causes the surface of the composition adjacent thebacking sheet to become moistened to reduce the effective adhesionbetween the backing sheet and the compositionto such an extent that thehacking sheet may be readily peeled off the composition withoutdisturbing the state of adhesion of the composition relative to thesurface to be insculptured.

Referring to the drawings:

Fig; 1 is a perspective View of a stencil sheet made in accordance withthe principles of my invention; and

Fig. 2 is a perspective View of the stencil sheet-applied to a surfaceto be insculptured. showing the backing sheet as being partially removedfrom the sheet of composition.

In the drawings. the stencil sheet 1 is SlMWn. as comprising a suitablebacking sheet Z. having on one of its sides a coating or sheet 3 of asuitable relmfiing composition. X is an article such as a body of stone.ctc.. having a surface :20 which is to he insculptured.

The component ingredients of the rebuffing composition are well known.usually consisting of a mixture of glue and glycerine in suitableproportions. Substitution of a well known substance of analogous natureto and for either one or both of the said substances may be made withoutdeparting from the .essential features of the invention.

The points of importance in connection with the rebufling composition asfar as this invention is concerned are that the composition be solublein water. and that the said composition shall have the requisite abilityto withstand or rebuff the assaults of the sand blast.

As this con'iposition invarious forms and composed of variousingredients is well known to the art. and forms no part of the presentinvention. no claim is made thereto.

The backing sheet 2. according to the principles of my invention.preferably composed of what is generally known as parchment paper, apaper which. when subjected to or saturated with water. will notdisintegrate.

larchment paper. as is well known. can be freely handled when wetwithout fear of dis-. integration. Other papers or fabrics of ananalogous nature may be employed without departing from the essential fatures of the invention.

The ll \'tllO-F()lld!l( rebuiling composition for the best practicalpurpos s is preteral 1 applied to the h \'drescopie backing sheet. anywell known mechanical device capable of producing-a coating of uniformthickness throughout. on the one surface of the ha king sheet.

The rebuliing' compound being applied to the backing sheet while in aplastic state adheres to the backing sheet and is subsequently dried.

The stencil sheet. before being applied to the surface to beinsculptured. is preferably submerged momentarily in water to soften theexposed surface of the re ulling compound in order that it will readilyadhere to the surface to which the stencil sheet is applied. I

The stencil sheet is then placed on the surface to be insculpt-ured withthe moistened exposed side of the rebelling compound adacent thereto.

The momentary suhmerging of the stencil sheet permits sutllcient of thewater to penetrate the backing sheet to loosen the rubulling compositionsulliciently to permit the backing sheet to be readily peeled oil therebutting composition without loosening the rebull'iug sheet from thesurface to be insculptured. to which it has been applied.

'hile I prefer to submerge the sheet. as above. noted. the exposed sideof the rebulling compound may be moistened before being applied to thearticle and the exposed face of stencil sheet has been applied. rolled,or

the backing sheetmay be moistened after the otherwise treated to flattenthe stencil sheet on the surface to be insculptured.

After the stencil sheet has been applied and the backing sheet removed.the rebulling compound is ready for immediate use. as the body of thecompound has not been atl'ected by the slight amount of water appliedfor the purpose of causing the compound to adhere to the surface of thearticle and for loosening the hacking sheet.

After the insculpturing of the surface of the article has beencompleted. the rebutiing compound which formed the stencil or shield isremoved in the usual manner.

I claim:

A process for ai iplying a hydro-soluble rehutl'ing composition to asurface to be insL-ulptured by ducing the compound to a substantiallyplastic state. applying the compound while in said plastic state to oneside of a acking sheet of parchment paper while said compound is in saidplastic state whereby said compound adheres -o said backing sheet.drying the coated sheet to solidly the compound. subsequently moisteningthe exposed face of the compound to produce an adhesive conditionthereon. applying this adhesive face of the compouml to the surface tohe insculptured. moistening the backing sheet to reduce the stateofadhesion between the sheet and the compound. and linally peeling thebacking sheet oil' the layer of compound.

LOUIS I). DAVIS.

sand blast. consisting of re-

